Re: [PATCH v3 1/2] dt-bindings: timer: mti,gcru

[Conor Dooley <conor@kernel.org>]

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On Wed, Apr 23, 2025 at 12:14:26PM +0000, Aleksa Paunovic wrote:
> HTEC Public
> 
> Add dt-bindings for the GCR.U memory mapped timer device for RISC-V
> platforms. The GCR.U memory region contains shadow copies of the RISC-V
> mtime register and the hrtime Global Configuration Register.
> 
> Signed-off-by: Aleksa Paunovic <aleksa.paunovic@htecgroup.com>
> ---
>  .../devicetree/bindings/timer/mti,gcru.yaml   | 47 +++++++++++++++++++
>  1 file changed, 47 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/timer/mti,gcru.yaml
> 
> diff --git a/Documentation/devicetree/bindings/timer/mti,gcru.yaml b/Documentation/devicetree/bindings/timer/mti,gcru.yaml
> new file mode 100644
> index 000000000000..6555dbab402e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/mti,gcru.yaml
> @@ -0,0 +1,47 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/timer/mti,gcru.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: GCR.U timer device for RISC-V platforms
> +
> +maintainers:
> +  - Aleksa Paunovic <aleksa.paunovic@htecgroup.com>
> +
> +description:
> +  The GCR.U memory region contains memory mapped shadow copies of
> +  mtime and hrtime Global Configuration Registers,
> +  which software can choose to make accessible from user mode.
> +
> +select:
> +  properties:
> +    compatible:
> +      contains:
> +        const: mti,gcru
> +
> +  required:
> +    - compatible

Why is this select required?
I don't see why it would be since there's not a fallback to a compatble
from some toher binding.

> +
> +properties:
> +  compatible:
> +    const: mti,gcru
> +
> +  reg:
> +    items:
> +      - description: Read-only shadow copy of the RISC-V mtime register.
> +      - description: Read-only shadow copy of the high resolution timer register.
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    gcru: timer@1617F000 {

Drop the "gcru" label from here, there are no users.

> +        compatible = "mti,gcru";
> +        reg = <0x1617F050 0x8>,
> +              <0x1617F090 0x8>;
> +    };
> --
> 2.34.1

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